ROCHA, GISELE O. daVASCONCELLOS, PEROLA C.AVILA, SIMONE G.SOUZA, DAVI Z.REIS, EDUARDO A.O.OLIVEIRA, PEDRO V.SANCHEZ-CCOYLLO, ODON2017-07-052017-07-052012ROCHA, GISELE O. da; VASCONCELLOS, PEROLA C.; AVILA, SIMONE G.; SOUZA, DAVI Z.; REIS, EDUARDO A.O.; OLIVEIRA, PEDRO V.; SANCHEZ-CCOYLLO, ODON. Seasonal distribution of airborne trace elements and water-soluble ions in São Paulo Megacity, Brazil. <b>Journal of the Brazilian Chemical Society</b>, v. 23, n. 10, p. 1915-1924, 2012. DOI: <a href="https://dx.doi.org/10.1590/S0103-50532012005000062">10.1590/S0103-50532012005000062</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/27617.0103-5053http://repositorio.ipen.br/handle/123456789/27617This study deals with the seasonal distribution of Al, Ca, Cu, Fe, K, Mg, Na, Pb and Zn and water soluble ions (Cl-, PO4 3-, NO3 -, SO4 2-, HCOO-, CH3COO-, oxalate, succinate, Na+, NH4 +, K+, Mg2+ and Ca2+) found in PM10 samples (particulate matter less than 10 mm in diameter) São Paulo City, Brazil, (April 2003-May 2004). Higher atmospheric levels were found for SO4 2-, NO3 -, Cl- and PO4 3- while the main organic anions were oxalate and formate. Atmospheric levels for elements were: Fe > Al > Ca > K > Na > Mg > Zn > Cu > Pb. Some sources were predominant for some species: (i) fuel burning and/or biomass burning (NO3 -, HCOO-, C2O4 2-, K+, Mg2+, Ca2+, Fe, Pb, Zn, Al, Ca, K and Mg), (ii) gas-to-particle conversion (SO4 2- and NH4 +) and (iii) sea salt spray (Cl-, Na+ and Na).1915-1924openAccessparticulatestrace amountselementsseasonal variationatmospheric chemistrypollutionbrazilArtigo de periódico102310.1590/S0103-50532012005000062